20115203120 has 120 divisors (see below), whose sum is σ = 48996447360. Its totient is φ = 7672089600.

The previous prime is 20115203113. The next prime is 20115203149. The reversal of 20115203120 is 2130251102.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12500876 + ... + 12502484.

It is an arithmetic number, because the mean of its divisors is an integer number (408303728).

Almost surely, 2^20115203120 is an apocalyptic number.

20115203120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20115203120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24498223680).

20115203120 is an abundant number, since it is smaller than the sum of its proper divisors (28881244240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20115203120 is a wasteful number, since it uses less digits than its factorization.

20115203120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20115203120 its reverse (2130251102), we get a palindrome (22245454222).

The spelling of 20115203120 in words is "twenty billion, one hundred fifteen million, two hundred three thousand, one hundred twenty".